Grinding and polishing machine



Oct. 5, 1937. l G. D. MooMAw 2,095,202

` GRINDING AND POLISHING MACHINE Filed June 17, n.935A 4 shuts-sheet 1 at; ils; A l LQ' 4 i 2 4P mm 5 A x5/@QW M-lfmssl JaY w/fm- N ATT uuml-:Y

Oct. 5, 1937. Gf. n. MooMAw 2,095,202

l -4 GRINDING AND POLISl-IING MACHINE Filed und 1v. 193s 4 suma-sheet 2 4 shuts-sheet'4- Oct. 5,4 1937. G. D. MooMAw l 'GRINDING AND POLISHING MACHINE Filed June 17,'1935 IHVENTDH -TT un um -WITHES 5 40 Still another object is to 4lis PAT-ENT I(ifi-nca zgoosgzoa y Gamme AND" rousnmtrmcnms George D. Moomaw, Syracuse, N. ass'gnor, by mcsne assignments, to Grlrciblc Steel Company of America, New-York, N.

tion of New-.Jersey Yi; a cumm- Application Jnne 1'1,v 1935. sei-iai 'N'e. 26,913 11 claim'. (el. 51.-.90)

This invention relates to improvements lin grinding and polishing machines in which an. abrasive tool is simultaneously rotated about its 'axis and revolved about the` work inpressure 5 engagement therewith and is an improvement over the structure shown in my pending applieenen serial No. 579,'i45, sied December s, 1931, 118W Pt. No. 2,009,451' (5l- 137) fgranted" July `a grinding or polishing machine'f in which an abrasivetool is lfoperatedat high speed for the purpose of producinga very high polish .upon the work in a minimum period of time.`

In carryingout the above mentionedobjec't I have mounted the abrasive or .polishing tool upon. a rotating head having .an o ening co-axial therewith for the reception of e work, and at one side of the axis of rotation'f saidhead. The abrasive or polishing tool is provided with 4means forn rotating the same about its axis and additional power means is provided for rotating polishing tool about the work simultaneouslyY while in operative engagement with the work.

Another object of the invention is to provide a rgrinding or polishing machineof the above nienV counterbalancing the abrasive or polishingfto'ol and the drive means therefor;A

t A still further object of the inventionn'esldes -in providingj means forI adjusting the work to-V ward the abrasive-br polishing-.tool during the. i operation'of the to'l. "e provide a `machine of the above mentioned class with means for auto- 'matcallyt maintaining the work; in cooperative relationl with the abrasive toolfasysaid tool is decreased in diameter during the use thereof. Another-object isJ to produce an apparatus vwhich is durable, fsin1pland" economicalfirx con--v struction and` which may Vbe quickly and easily adjusted for work having diierent diameters and.

50 rials, ...i

Other objects. andadvantages pertaining to the detail structure of the device will`more fully appear* fromthe following 'Zdescription taken. in

wmemw,

L connection with the* accompanying .drawingsin The main object of this invention. is to provide Y with the rotation of th'e tool'upon its own axis,

. operation of, the wheel.

A -further object of the invention to provide adjustable means associatedv with the head for "4 The device, as

vyond the' sides of the standa `Figure l1 is a side elevation of, an apparatus embodying thevarious `features of this invention with portionsthereof broken' away and in section to illustrate the underlying parts. Figure 2 is an end elevation as viewed sub- 5 stantially from line 22, Figure 1.

Figure 3 is a detail horizontal sectional view taken on line.33, Figure 2.

Figure 4 is a vertical sectional view taken on 'line 4 4, Figure 3. I

Figure 5' is a horizontal detail sectional view taken on line 5-5', Figure (i.I

Figure 6 is a vertical sectional view through one of the abrasive tools, the carrier head for said tool and the adjacent end of the support. or l5 standard taken substantially in the plane of the line B76, Figure 2. A

Figures 'I and 8 are detail sectional v iews taken respectively on. lines 'i--T and 8&8, Figure 6.

Figure 9 is a transverse isectional view of one l 20 of the carrier heads taken substantially on line Si-ll, Figure 6.

the head and therebyto' revolve the abrasive or ."Figure 10 is ajdetail sectional view taken on linelli--IIL Figure 9. 4

Figure 11 is a fragmentary endview similar 25 .to Figure -2 and illustrating a modified form. of wor supporting means which is adapted to auto- 'matlcally the work in cooperative engagement with the-abrasive wheel during the i 30 "Figure12 is aectional view taken online I2- I2 Figure 13.. I

Figure 13 is a d tail sectional line` l3--I3, Figure 11. Figure 14` is a sectional view taken on line 35 ll-il, Figure 13;

view taken on illustrated in Figures 1 to lil inclusive, `comprises a standard l'. formed with a pair 'of horizontally disposedshelfportions 2,- varrangedone `at either side of the standard I. 40 A shft 3 is journaled p'in the upper end of Athe standard I inV suitable bearings 4 composed, inthis instance, preferably of bronze. The shaft 3 has the ends thereof extending outwardly berdLandhassecured thereto a respective supporting head 5. Any suitable means may be provided for maintaining the. shaft 3`against am'al movement in the standard which is composed of different jgrades of xnatelK and, for this purpOse, -the shaft is provided with a pair of axially spaced annular anges 6, one of which is shown in Figure 6, positioned in corresponding recesses provided in the bearing member` l. o .Y Y'

' Each head 5 may be secured-'tothe 'respective end of the shaft 3 by any suitable means where- 55" 75 aange :1 formed by ma shaft and removably scour-edito the head by, screws `Il. opening I, in thisinstance, is substantially octagon in'cross section and is of greater width radially thanthe corresponding transverse width of the case I3 of the motor 9 which is also formed octagonal in cross section similar to the opening l. 'I'hetransversefwidth of the openi118` 3 is also I3 and a pair1 of in the opening, side thereof.

'I'he guide blocks are maintained in fixed relation in said :opening by screws I5; as shown iinFigures 9 and l0. 'Ihe'inher-.face--of each -xguide block I4 is provided'with a longitudinal guide recess It for the reception of a guide lug for way, Il, provided ongpposed side faces of the motor case I3.` 'Ine-guide ways I'I"aredo,ve` v tail in cross section and of less width than that ofthe recesses II. Each guideY way I 1 is slidably secured in acorresponding guide recess I9 by a gib I9, which is secured to the corresponding guide block I4 by screws I9. The openings,` as 2l, in eachgib I3.

screws I9, are elongated so that 'said gib'may be adjusted laterally to take A upj wear and maintain the guide ways in close sliding relation withV the`correspondingguide blockt Screws, as`L2I vided in each guide block I4 for effecting theiateral movement of the gibs'll1 toward the corresponding' guide ways I1 when the screws I9 are loosened..' n

The innerside of theopening 9 is extended intc the adjacent side of the shaft 3, as shown' in Fl'gurei9, so that Vthe inner wall of said opening extends diametrlcally through the axis of Said shaft. "I'he shaft 3 is provided (a central longitudinally Vextending `ception of the wire stock, as S, to be ground or polished, and this opening is lpreferably of considerably greater diameter than that of the stock to.not only permit f the stock through the` opening, but teN also proguide blocks I4 are mounted transversely ofs the gib vide'for the lateral movement of the stock in said opening to a certain degree toward the connected with the motor 9.

grinding wheel 24 The inner face ofithe motor case I3 'is pro- 'videdwith an axially disposed inwardly extend-'ff ingjgtove or channel 25, as shown in Figures 9 and 10, which saiwwnll nf the case. and is in alignment with the shaft opening 23 so asto receive the stock S therein when the motor case is moved to its innermost position, as the abrasivewh'eel 24 decreases in diameter by wear and the'rebyprovides iorv the maximum use`of each abrasive wheel, before replacement is necessary. motor 9 and the abrasive wheel 24 carried there by are moved radially to obtain theV proper ad- -Justment of the wheel 24, relative tothe stock S by means of a screw stud 25 which is journaled in the cap Il, and has the inner end 26' thereof ,screwrthreaded in ka suitable aperture provided in theA outer wall of thecase I3,as clearly-illustrated in 6 and gitided with an annular outer'wali ofthe opening 3, as illustrated in Figstud relative greater than that of the motor case,l

one adjacent either transverse S for the.

- Each screw is` provided thefree axial .movement of extends nearly completely through- The 9. stud 29 is pro- 011 periphery thereof lidiastud A29 extends Fa. short beyond the cap i9 and has secured thereto an hexagonal head which not only provides means wherebyI the stud may be to eii'ect radialadiustment of the' motor case Jl, but also co-acts with the ilange 21- f or'preventing axial' movement ofthe'.

to the cap Il during the rotation, thereof.

As shown in Figure 6, the armature shaft of themotor 9 is journaled in rolling bearing members 3|, mountedin the Iend members or caps 32 of the case I3..' One end ofthe armature shaft 3l extends outwardly' beyond the case I3 and head 5, and suitable manner,- abrasive wheel 14.

As shown wprovidedwith a, plurlatlityY of, in thisl instance. three substantially cylindrical'recessesl 34 arranged in uniformV circumferential spaced relationat-theJ opposite side on the he`ad to that v.in vwhich the motor 9 is mounted, and which extend radially inwardly from corresponding flattened sides of said head. 7Cap members 3i are secured to the head by screws or their equivalents to close the outer ends of a respective recess 34.V In each recess, is ,weight 39 composed preferably of lead and which, las show n in Figure 7, is cylindrical in form. `Cast within each weight 36 is a metallic bushing` 3l'v having the interior thereof provided with screw threads for the reception of a respective as hereinbe'fore mentioned Figure 10, may be proadjusting screw 3l.

Each of the screws 38' extend centrally into a\ respective recess 34 with the inner end thereof in contact with the inner end wall of the recess:`

tending annular flange' 39 which is positioned in a corresponding recess provided in the vinner ace of the respective cap 35 for maintaining the screw against outward' axial Amovement. 'Ihe ner face` of the capl Il. The outer. end ofthe .Y

has mountedtlnareon. in any(V withan outwardly ext0V mounted/a counter- 30 outer end of each screw preferably extends a short distance beyond the-corresponding cap 35,

and is ilattened or squared for the reception of a wrench by which-the screw A retaining Din 49 is m 34 at one side of thegscre received in a suitable longitudinally disposed hole provided in the weight 39; as v6 and 'I,` for maintaining the may be turned.

weight against ron nted 1n enen recess,

\shown in'Figux-es l,

tary movement during the turning of the screw and. at the same time, ment of said weight in t e recess. It will now be observ d that as the motor9is adjusted. toward and of the shaft 3by the,manipulation 26 to bring the abrasive wheel 24 engagement with the stock passing through the shaft opening n, che weight n f said motor and of the screw,

,'from the axis of rotation into proper wheel may be readily counter-balanced by the .proper manipulation of the screws 3 9 and the weights at connected therewith, `and thereby,65

maintaining a smooth nperating machine which will functionl with the `,minimum amount of vibration.

"I'he motors 9 may he of any construction adapted 4stant speed and, for this purpose.- I preferably use two-pole, three-phase,50 to 60 cycle, 220 volt alternating current motors which; as is obvious. will run at a constant' speed at agiven frequency and with a minimum suitable type ors amount or v ibrntory move- 7.5

w 13s and is suaabxy 5.o'

rmit free axialxmove-55 to revolve `at uniform conl 1lir - for the motor. This generator motor and rheo stat are not shown, but it is 'to be understood that ment. It is preferable that the speed of these motors be changed from time to time during the out the length thereof and it will be readily. understood, the change in the speed of the motors of this typeis readily accomplished by changing the 'frequency of the `current supplied to said motors.

'1, therefore, preferably` supply current to the motorsS from a generator which in turn is driven by a suitable .electric motor, the current for which is controlled by a rheostat or other suitable means,positioned inthe electric circuit they may be provided in .the same manner-as vthat shown and described in my hereinbefore mentioned co-pending application.

In order that the circuit vmay be continuously supplied to the motors 9 during the rotation of the supporting heads 5, I connect the wires as W, Figure 6, leading from the source of potential, as the above-mentioned generator, to respective brushes42 provided for each motor and ing arm 43 secured to the standard I.

4which are carried, by a suitable brush-support: The brushes 42 which, in this instance are three in numbenare maintained by the arms 43 in operativeengagement with respective collector rings 44, mounted in electrically 'insulated spaced relation upon an inwardly vprojecting Vhuh 5'associated with each head 5, as shown in Figure 6.

Each set of collector rings 44 may be electrically connected .with a respective motor 9 by anysuitable well-known means which isl believed to be not necessary to herein further illustrate or describe.

The heads-5 are'rotated independently of the operation of the motors inthisinstanca by an electric motor 46 mounted in any suitable manner in the standard I as illustrated by broken lines in Figure 1.

beyond ,one side of the standard i and connected with the head 5 at the corresponding side of the standard by means of sprocket wheels secured respectively to the armature shaft and to the hub 5' and a suitable chainbelt,`as illustrated at 48, Figure 1. i

Each head 5 has operably connected therewith one of my novel work holders 50 for maintaining. ythe stock as S in pressure engagement with the operation thereof. Each of these workholders 50 comprises a supporting bracket 5,1 4which is` plane passing through the axis of thehead 5 and bracket 5 I"-in parallel relation J the shaft-'3 .and head'5.

motor 9, as indicated in Figure 8. The' inner, forward edge ofthe bracket 5I is provided with a recess 5|' whichextends longitudinally of the with the axis of The armature shaft of thev motor 46 is extended outwardlyV a short distance l periphery f the abrasive wheel 24 duringy thel by screws 55, as shown in Figures 5 and 8. The holding platev 53 is preferably Vof such a width that .the outer or forward longitudinal edge thereof terminates from the diametrical plane passing through the axes of the shaft 3 and motor 57a distance substantially equal to one half. the

diameter of the stock S so as to maintain said stock substantially co-axial with the head 5- in fixed pre-determined relation with the wheel 24 and thus prevent thev stock being moved laterally by said wheel during the rotation thereof. It

will be understood that thewheel 24 is so rotated thatthe peripheral surface'vthereof engaging the stock S will travel toward-the work holding plate 53, as indicated by the arrow X in Figure 8.-

Secured-by bolts or screws 51 to the side of the bracket 5| adjacent the holder plate 53, is a guide member 58 which, in this instance, comprises a pair of side plates 59 and Eiland an intermediate spacing block 6l. The side plates 59 and 60 extend downwardly toward the axis of rotation of the head 5 a short distance below the spacing block 6| to form a guide channel 62 for the reception of a pressure bar 63' which is slidably mounted for longitudinal movement in said channel. --f

The guide member 58 is secured to the bracket 5I at an acute angle to the axis of rotation of the head 5, in Figure 6, while the upper or outer longitudinal face of the pressure bar 63 is correspondingly tapered so that when the bar is in the channels 62 the lower 'or inner longitudinal surface of the bar is maintained in parallel rela- `A tion withthe axis of rotation of the head 5, and

Y. secured to the bar by a plurality of screws B5, one

of which is shown in Figure 8. The Wear plate E4 is preferably rectangularin cross section and I preferably provide holes therethrough for the screws 65 having opposite ends countersunk so that either side surface of the plate may be positioned for engagementv with the stock S, and

vthereby provide for maximum use of the plate.

The Wear plate G4 is of greater length than the width of the Wheel 24 so that saidplate will be in engagement with the full lengthof the stock S contacted by the Wheel 24 throughout `the range of adjustment of the bar 63.

The pressurebar is extended outwardly be- This plate or head 61 is in co-axial alignment with the shaft 3 and has a central opening 6B therethrough for the receptiorrof the 'stock S.`

l Each bar 63 is slidably maintained -in the chan, Vnel A62vby means of a pair of retaining screws-10 which are screw threaded in the bar E3 in longitudinal spaced relation and extend outwardly therefrom through an elongated slot 1I provided in the spacing block 6I intermediate the screws Mounted on the screws 10 in engagement with the head thereof is a retaining plate 12, andaspring 13 is mounted on each screw; between the plate 'I2 and a second retaining plate T2 also mounted on vsaid 'screws and positioned in engagement with the upper face of the spacing block Gl. The length ofthe slot 1| is sufficient to permit the maximum adjustment of the bar 63 in the guide 58 andthe bar is manually moved longitudinally in the guide 58 by means of ant head therein.. '..The hand-nut 11 is rotatably threaded on sa.id screw.

The screw 16 has one end portion thereof provfided with` a Vrecess16 which extends inwardly from one side thereofA and is substantially the same width as"jth`e head 61 fox; receiving 'said mountedi'in the upper end of an arm I8 which is `pivotally connected near its lower end, as at 18 to the upper end of a bracket 88 secured to the adjacent. shelfZ. The lower end of the arm 18. below thepivot 18 is somewhat reducedin Y widthte 'ferm e stop member n' adapted to yengage a shoulder or ange`88' provided o n the upper end of the bracket 88 for limiting the outward movement of ,the arm. The arm 18 is maintained in its normal" upright position by means of 'a thumb screw 8| mounted in Athe upper obedece Arteithe meter and weights here thus been end of the bracket 80 above the Vpivot 18 andE which is normally received in a suitable slot -or recess 82` provided in the adjacent longitudinal edgeofthearm18. Y y.

Thefpivo'tal movementof the arm 18. is sufll- Vcient to bring the adjusting screw 16`out of` hold-f ingeng'agement withV the head 61 and the handnut 11 out of the path'of movement of s aidhead, Iwhereby the bar 63v may bereadily withdrawn from thegmde 5s. after the retainingserews 1n have. been removedtherefromqla 'I'he 'adjusting screw 16 may,` as sho'wn more clearly in Figure 3,

be supportably maintained in engagement. with the 'head 8 1 by means of a supporting shoe 83 secured to the upperend of the arm 18 and which hastheface thereof adjacent/the head'61 pro- `vided with alongitudinally disposed groove or channel 83 adapted to lslidably receive the adsion block 85 of any suitable construction posi- Itioned preferably adjacent the inlet end of the :around adrive pulley 8| on the amature shaft r3 and heads 5 bythe tension blo'c'k 85 and guide jacentendof the screw I6v therein.

Thebperation of the machine will nowV be 'readily understood to be as follows: J

.The wire or stock S may, `as/illustrated in Figure 1, be unwound from a spool B carried on a. revolving reel C and threaded through a, tenmachine and thence'through the opening 68 in the adjacent `Vhead 6 1 then through the opening' 2 3, in the shaft 3,- after which the stock is passed throughhe opening es in the head 61 and e' guide 'member 85 positioned adjacent theoutlet end of the machine and then to a takeeup drum 81-m6untd on ashaft 88. vThe shaft\88 may be driven in any suitable manner as from a motor -88\ connected therewith by a ebelt 88, passing of the motor and a pulley 92 secured ',t a shaft 83 which, in turn, is operably=connected r@Vith the drum 81 by means of a pair of gears 84, one of which secured to the shaft 88 and'tHe other one is secured to the shaft 83, in any suitable ma ,ni 1er.. f.v f ML After the stock has th'us been positioned, each abrasive wheel 24'is moved radially relative to the headi by the manipulation of ther screw 28 to bring the peripheral surface thereof into con-l tact with the steel; s which, it will'l beunderstood, is maintained in co-axiai relation with, the shaft ,l 86 whichrhave openings therethrough arranged in alignment with'the axis 'ofthe shaft 3. After the wheels 24 and motors 9 connected therewithv have thus been adjusted, lthe counterbalance weights`36 are then "adjusted by the manipulation of the screws 38 for balancing the heads so that the same will rotate witha minimum amount of vibratory movement.

This ability to lninutely resetting `the -machine adjusted, the pressure -bars 68, which had previouslybeen moved to their outermost DOSMUM. are moved inwardly to bring the wearl plates 84 vinto contact with the adjacent portions of the stock S. f -V 1 It is n'ow obvious that by starting the motor 88, the wireor stock S maybe steadily drawnfthrough the shaft 8 across the peripheralfaces of theabradingwheels 24 `at a uniform rate of speed.

The motors 8 and 46 may now be started which will cause theI wheels 24 to rotate in a clockwise direction, as indicated by arrow X in .Figure 8.

At thesame time, motienis imparted to the needs 6 by the V"motor" 46 causing the heads and the wheels carried thereby to revolve about the stock S'for'moving the work holder 6| in a direction opposite to the direction of .travel of the adjacent peripheral surface of the wheels or in an anticlockwise direction-as indicated by arrow Y in Figure 2. 'I'he ypressure bars 68 are 4thex'i adjusted by the manipulation of ,the hand-.nuts 11 and `.screws 16 to bring the stock into therequired that the degree of pressureof the stockI on the abrasive wheels maintained by. the work holders may be varied as desired'to effect a greater or less degree of grinding or polishing action on the stock. It will also be observed that the surface speed'of the abrading wheels 24 may be controlled Vat .willirrespective of the speed of the heads 6 4by varying-the frequency of the currents applied to the three-phase wheel actuating motors 8, which may be acompllshed in any well-known mentioned.

speed of the abrasive wheels and the speed at which they are revolved about the work independently of each other, together with thefability to govern the 'pressure under which the worklis lengaged by the abrasive wheels by the manipulation of the hand-nut 11, not only permits the' grinding and polishing operations to,be` accompl/ished in the minimum amount of "time, but also enables the maintaining'of the nish'ed polished Work at a pre-determined size or diameter reof the stock or the degree of temper'thereof. or of different' grades of materials ofthe work which It will 'also be observedthat eration'of, the machinemay be greatlyprolonged 'due to the fact that as the peripheral surfacesjof the wheels 24 are worn laway by th grinding bpthefcontinueus" control the surface gardless of any variationin the initial diameter( 55 may occur without the necessity ofi stopping or eration, the work may be readily adjusted toward the fWheels` by the work. holders while the machine is in operation, all/offwhichbontributes tothe high degree of efiiciency of`this5macliine,

,particularly inasmuch: as this .latral adjustment of the stock by meansfof the work-holders maybe' safely effected to 'a limited degree without producing whipping or excessive vibration. of .th`e

stock due to the eccentric relation thereof with the axis of rotation of the heads 6 and the abrasive wheels carriedth'ereby.

,In the operation of the machinait is preferable 40 manner as by varying the speed of the generator for supplying the current thereto, as hereinbeforev that the stocks he'maintmhe at wntnhhl etti temperatureduringthegrindingor polishing op-` eration and, therefore, afcase, as indicated by 'broken lines at $1' in-Flgure '1, may be ,mounted upon each shelf Lover a corresponding abrasive y wheel 2l adjacent the-outer sin-face of the head associated therewith Water or other rcooling liquid maybe readily suplied to the cases 91 by any suitable means (not shown) and this llquidf-itogether with the ne loose particles of stock produced by the action of the abrasive wheels, may be carried by conduits, as 98, secured to the shelves 2 in com-`V cam member III is provided with a radially dlsmunication with the interior oi' the respectivey l5 cases's'l to a suitable vat or drainage (not shown) for separating the liquid from the solids.

InfFlgures 11, 12, 13, and 14, I have illustrated a modified form of work 'holder particularly adapted Ato be used in connection with the -head and grindingtool illustrated inthe remaining gures of the drawingsA for automatically maintaining the work in'pressure engagement with the abrasive during the operation of said tools. This work holder, as |00, comprises a bracket head 5 by screws |02, in the manner hereinbefore described, for the work holder 58. The bracket H|0|, in this instance, has a lower or inner longitudinal face thereof arranged in substantially parallel relation with the axis of rotation of-the head 5, and a holding plate |03 is releasably yse- |0| which is secured tothe outer face of each posed arm |2| which extends outwardly from the periphery thereof and may, as vshown inFigure 11 be provided' with a weight |22 which is adjust- 15 ably secured thereto by means of a screw |23 or its equivalent whereby `said weight' may be`moved toward or from theaxis of rotation of `the cam as required for producing the proper pressure of the stock upon the abrasive wheel... Y

The-arrangement of the cam ||4 and arm |2| relative tothe direction of rotation of the head cured to the lower. longitudinal surface of the bracket by means of, screws 0l screw threaded in the lower portion of arms or lugs |05 secured to or madeintegral with the bracket |0| and which extend downwardly beneath the holding plate |83 adjacent either end thereof, as illustrated in Figures 12 and 13. To the other andinner end portions of the bracket |0I, is secured a respective angle guide member |06 and |01, as illustrated in Figures 13 and 14.-

A slide |08 is mounted on the forward side face of the bracket |00 beneath the guides |06 and |01 for movementtoward and from the aids of ro-` tation of the head'5. The slide'A |08 may,` as illustrated in Figure 14, be alsoprovided with guide ways |09 which, in this instance, are substantially V-shaped in crossv section and adapted to ride f in corresponding V-shaped grooves provided in corresponding guide blocks |10 mounted in the bracket 10| forI accurately guiding and maintaining -the slide, during the radial. movement thereof, in parallel relation. with the axis of rotation hf the heads and shaft A pressure bar is'secured to the lower edge of the slide ||0, as illustrated inngure 12. This bar extends downwardly or inwardly from the inner edge of said slide in close proxiniity with the adjacent edge o'f the holding plate |03 for cooperating with saidholding plate to maintain the stock in pressure engagement with the periphery of the abrasive wheel 24. I

In order that the slide |08 may be automatically moved radially toward the corresponding `alzarasive wheel 2l during the operation of themachine, and thereby maintain Vthe stock in constant presure engagement with said wheel as the 5,1s such that the cam willLhe actuated by the centrifugal force produced on the arm and weight for effecting inward radial movekment of theslide 29 |08 and thereby automatically maintain the stock in pressure engagement with ,the abrasivel wheel. Although I have shown the standard as being provided with a pair of heads 5 and abrasive l wheels 24, 'it is evidentthat I may utilize but one 30 head andiabrasive wheel..` Furthermore, it will be understood that other changes in the' con- ,t struction both of theH grinding'. heads and the work holders associated therewith and in the y form and the relation ofthe parts thereof, may

readily be made without departing from vthe spirit of the invention, as set forthA in the appended claims.

I claim: f

1. In a grinding and polishing machine,4 a supnl porting head,'means for rotating said head, an

abrasijve wheel mounted on the head at one side of the axis of movement thereof, a work support connected `with the head'to rotate therewith and comprising a movablemember, and meansactu- 4i ated by the head during the rotation thereof for -automatically adjusting the.l movable memberto7 ward the abrasive wheel. l y l,

2. In a grinding and polishingmachine, a supporting head, having an axiall passage therep stock in substhntiauy zo-axial relation with the 55 head, an abrasive wheel operably mounted on the supporting head, an adjustable work holder, and

` operating means for the work holder including44 a wheel is decreased .in diameter by 'wear'. I have member pivotally connected withr the work holder to swing aboutx an axis extending substantially parallel with the axis of rotation of theU head adapted to be actuated by centrifugal force for automatically moving' the stock laterally as the wheel decreases in diameterto maintain the worl.

. in pressure engagement with the abrasive wheel against thev action of said stock feeding means.

3. In a grinding and polishing machine, the combination with la. rotatable supporting head and an abrasive` member operably mounted on said head to be revolved thereby about a 'piece' of 70 work in operative engagement therewith, of a.i work holder comprising a work holding member mounted in iixed relation. with the head in closeproximity to the operating surface of the abrasive member to maintain the work against lateralV dis- 75 portion of the bracket 10| asbv screws D member, and automatic 7means for actuating/said pressure'member relative to .theholding member l to move the work toward the abrasive member* during the operation oi said memberi 5. In a grinding and polishing machine,.the

Acombination withra rotatablesupporting head and an abrasive wheel operably mounted on said head for engaging work, of a workhoiding means mounted on the head to rotate therewith and including \a pressure member movable toward and from the' abrasive wheel, and means mounted on the head and actuated by said head for -automaticaliy adJusting the vpressure member relative to the abrasive wheel during rotation of the head.

6. In a*` grinding and polishing machine, the combination with a rotatable supporting, head and an abrasive wheel operably'mounted on said head to be revolved thereby about a work piece.' of. a work holding means mounted on the head to rotate therewith and, comprising a support,` and a pressure member mounted on the support in cooperative relation witlfthe abrasive owheel, said member having movement relative to the support in a direction parallel with the axis of the worl, `manually operable means for roducing said axial movement of the pressure ember including a disk connected to the member and arranged coaxially with thehead, and means associated with saidA passage, of a work holding means mounted on the supporting means to rotate therewith and including"a pressure member arranged in op- 'posed spaced relation with the abrasive member for receiving) the wirefther between, and =means including an operating t mounted independently of the supporting means, and coacting control elements connected-with the supporting means and.. one of said members for'pro- 'ducing relative movementoi the pressure member and abrasive member toward'leach other durfing the rotation of the supporting means and whereby the wire will be maintained in operative relation with' the abrasive member with unyieldjing pressure.

8. In a wire grindingand polishing machine,

the combination with an abrasive member, a.

rotatable supporting means therefor having ,axial passage therethrough -fr the wire and mean for continuously feeding the wire througlrsaid passage. of an adjustable work holding means mounted on the supporting means to rotate therewith and including a ypressure member arranged ip opposed spaced relation with (the abrasive member for receiving the wire therebetween. and means including an operating unit mounted independently ci the supporting means and a,;

pair 'of co-acting control elements connected' respectively with the supporting means and' with said pressure member for producing movement of the pressure member toward the abrasive member during the rotation of the supporting and whereby the wire will be maintaine in 0perativerelation with the grinding member with unyielding pressure, l

9. In. amachine for grinding and polishing f continuously-moving 'ilexible wire stock, the combination with a rotatablel supporting mechanism and an abrasive member operably mountled on said mechanism. to be revolved thereby meins about the wirev stock, of 'a work holding means and a work pressure member mounted onthe, supporting mechanism to rotate therewith in cooperative Irelation with each other and with the at .one Aside of the supporting.

vand means associated witlrthe pressure mem- ,ber and with the holding means rendered errectivefby the action of the control means upon the pressure memberior adjusting said pres sure member toward and Afrom the abrasive mem- -ben and for ilxedly holding said pressure member inthe adjusted position.- 'f

10. In' a machine i'or grinding andl polishing continuously moving ilexibie wire stock: the combinauon with rotatable supporting mechanism and an abrasive member operably mounted on said mechanism to 'be revolvedk thereby, about the wire stock, of a Aworkholding rneans and a work pressure member mounted on the supporting Pmechanism' to `rotate therewith in' -coopera- 'tive relation with each other and with the abrasive member, said pressure member having move ment relative to the holding means in 'a direction substantially parallel with the direction ,ot movement ot/the wire stock', manually perable control means mounted independently o the supporting mechanism. and operatively connected with the pressure member to produce said axial movement thereof,. and means associated with the' holding means and the pressure member co' ated during said axial "movement or me latter member for eilecting movement of said-member '.tward and from-the abrasive member.

'11 .YA device as set forth in claim 10 wherein said` latter means includes guide surfaces arranged in slight angular relation with thev axis oi" rotation of the supporting taining the work in operative engagement with the abrasive member with'unyieiding pressure.

s 3 GEORGE D. MOOHAW.

Amechanism maini 

